A convenience store is interested in studying its weekly sales. They believe that the average sales is $9000. The weekly sales for the last 10 weeks are presented in table below. Conduct an appropriate hypothesis test at 5% of significance level using the critical value method.

Week

1

2

3

4

5

6

7

8

9

10

Sales

9000

8850

9100

9250

8740

9100

8800

9050

8800

8700